Requirements.txt to pyproject.toml Converter

A requirements.txt to pyproject.toml converter helps migrate a Python dependency list into a project configuration file. A requirements.txt file commonly lists packages and version constraints used by pip, while pyproject.toml can define project metadata, runtime dependencies, Python compatibility, and build-system requirements.

The files serve related but different purposes. A requirements file may also contain pip-specific directives, included files, editable installs, or hash options that do not map directly to the standard PEP 621 project dependency field. These entries need appropriate review during migration.

Use the converter to prepare a starting pyproject.toml file from your existing Python dependencies.

1. Paste your requirements.txt content or select a local .txt file.
2. Enter your project name and version.
3. Set the Python version requirement and choose a supported build backend.
4. Add optional project description and author information.
5. Review the generated TOML and inspect any line-specific warnings.
6. Copy the result or download it as pyproject.toml.

Before committing the file, compare the generated dependencies with your original requirements and validate the project using the packaging tools used by your project.

A requirements.txt file is commonly used to specify packages for installation with pip. It can contain package requirements, version constraints, environment markers, and pip-specific options. It is often used for environment setup or deployment workflows.

A pyproject.toml file provides a standardized location for Python project metadata and build configuration. With the PEP 621 project table, a project can define its name, version, Python compatibility, and dependencies in a structured format.

Moving dependencies to pyproject.toml does not automatically replace every requirements-file workflow. Deployment lock files, development requirements, constraints, indexes, hashes, and environment-specific installation steps may still need their own configuration.

Dependency constraints communicate which package versions a project can use. Common operators include == for an exact version, >= for a minimum version, <= for a maximum version, ~= for compatible releases, and != for excluded versions. Multiple constraints can be combined.

Environment markers can make a dependency conditional on factors such as the Python version or operating system. Extras can request optional features provided by a package. The converter preserves recognized requirement lines in the generated dependency list, but complex or malformed entries should be checked manually.

Preserving a requirement string is not the same as confirming that every package exists or that all constraints can be resolved together. Use your project's package-management workflow to verify dependency compatibility.

The build-system table in pyproject.toml specifies the packages needed to build a project and the backend responsible for the build process. This converter provides three common choices.

• Setuptools: a widely used backend that supports many established Python packaging workflows.
• Hatchling: a modern backend often used in projects configured around Hatch.
• Flit: a backend designed for streamlined packaging workflows, particularly for Python packages with straightforward layouts.

Choose the backend that fits your repository, package layout, and build requirements. Selecting a backend in the converter does not configure package discovery, data files, scripts, or other project-specific packaging details automatically.

A successful TOML parse confirms that the generated document follows TOML syntax. It does not prove that the project metadata follows every packaging specification or that the dependency set can be installed successfully.

After conversion, review all warnings, verify the project name and version, confirm the Python version requirement, and inspect dependency markers and direct references. Then use the packaging and dependency tools appropriate to your project to validate the configuration and test a build.

Do not assume that pip options, hashes, included requirements files, editable installs, or private package index settings have been migrated just because a pyproject.toml file was generated.

The converter processes pasted requirements and selected text files in your browser. It does not need to upload the source file to a conversion server. The workspace supports pasting text, selecting a local file, reviewing the generated configuration, copying the TOML, and downloading the result.

Local processing describes how this tool handles the conversion; it does not guarantee the privacy or security of other browser extensions, devices, or applications. Review the generated configuration before using it in a production project.